Cellucor C4 is a leading pre-workout supplement trusted by men and women of all training levels. It provides high-level energy and performance with a premium formula that includes 150mg of caffeine. Made in Canada, C4 Original is available in various sugar-free flavors. It contains CarnoSyn Beta-Alanine to support muscular endurance and fight fatigue, which may cause a harmless tingling sensation. To use, mix one scoop with 6 fl. oz of water and consume 20-30 minutes before training. It is not recommended for pregnant or nursing women, or those taking nitrates for chest pain.